package com.hmall.gateway.filter;

import cn.hutool.core.text.AntPathMatcher;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.utils.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@RequiredArgsConstructor
@EnableConfigurationProperties(AuthProperties.class)
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    private final AuthProperties authProperties;
    private final AntPathMatcher antPathMatcher = new AntPathMatcher();
    private final JwtTool jwtTool;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1、判断是否要进行登陆的请求
        ServerHttpRequest request = exchange.getRequest();
        if (isExcludePath(request.getPath().toString())) {
            //如果不是需要登陆的地址则放行；比如：登录、搜索商品
            return chain.filter(exchange);
        }
        //2、如果要登陆：获取请求头的属性authorization 的值就是令牌
        String token = exchange.getRequest().getHeaders().getFirst("authorization");
        try {
            //3、校验令牌；获得用户信息
            Long userId = jwtTool.parseToken(token);
            //4、将用户信息传递到后端微服务
            System.out.println("userId = " + userId);
            //将用户id设置到请求头：改写request对象，设置请求头到后端的微服务
            exchange.mutate().request(builder -> {
                        builder.header("user-info", userId.toString());
                    }
            ).build();
        } catch (Exception e) {
            //校验不通过则返回，没有授权：401
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //校验通过则放行
        return chain.filter(exchange);
    }

    private boolean isExcludePath(String path) {
        for (String excludePath : authProperties.getExcludePaths()) {
            if (antPathMatcher.match(excludePath, path)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
